| http://www.w3.org/ns/prov#value | - Fourth: The metals increased its volume and size by combination with other elements, e.g. the oxygen may combine with iron, so it will increase in its volume, and ferric oxide will result; and carbon dioxide combines with calcium forming calcium carbonate; and nitrogen combines with sodium and potassium resulting in sodium nitrate and potassium nitrate; and so on gases combine with most of the met
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